Hundreds of homes are feared to have been destroyed by intense wildfires that tore across southeastern Australia in ferocious wind conditions Thursday, darkening Sydney's skies with smoke and ash, firefighters said.

Five major blazes were burning across the state of New South Wales, fanned by high, erratic winds in unseasonably warm 34 degree Celsius (93 Fahrenheit) weather, as infernos in the Blue Mountains west of Sydney plunged the city into an eerie, ash-flecked darkness.

"We are unclear yet as to how many properties have been lost, but it's expected by the time we finish counting, it will be at least in the hundreds," said NSW state Premier Barry O'Farrell.

"It will take some days to see the end of these fires and I suspect if we get through that without the loss of life, we should thank God for miracles."

In total, 95 fires were being tackled across the state with 34 out of control.

NSW Rural Fire Service Commissioner Shane Fitzsimmons said it had been a "very difficult and dangerous day" of "extraordinary fire behaviour", with blazes travelling vast distances due to the winds.

"This is as bad as it gets, you're talking destructive, damaging, and people losing everything they own," he told reporters, adding that it could be weeks before the fires were fully under control.

No fatalities have been reported so far, while just one firefighter has been injured, alhough Fitzsimmons deputy Rob Rogers told ABC television the fear was that people could be in the destroyed houses.

"We will be counting the toll of this tomorrow and indeed days to come, as far as the real impact on this fire," he said.

"We will be very lucky if we haven't lost at least a couple of hundred homes. The real fear, of course, is that there would be someone in them."

Springwood man Joe Moore told Sky News his house had been razed while an estimated 40 other homess had been lost in the village, though that figure could not be confirmed by officials.

"It's about as bad a situation as we could ever have hoped for," he said.

"It's one of those things, if you want to live up in the Blue Mountains it's a beautiful place to live, but it has the dangers of nature's ferocity like we had today."

The blaze was believed to have started when a power line came down in strong winds, according to media reports.

Sydney health authorities issued a respiratory alert after a blanket of smoke settled over the city, bathing familiar landmarks including the Opera House and Bondi Beach in an otherworldly amber hue and causing ash to rain from the skies.

The plume was so thick it showed up on the nation's weather radar.

The winds forced the grounding of water-bombing firefighting aircraft and residents of the Blue Mountains were urged to stay off the roads to clear the way for emergency vehicles.

"The problem is when you've got aircraft over fires like that with (those) winds, a lot of the time they're just getting knocked around in the sky," RFS spokesman Joel Kursawe said, adding that embers were being carried up to six kilometres.

Fitzsimmons said there would be a reprieve for fire crews on Friday with cooler, less breezy conditions expected, but the danger would ramp back up on Sunday and Monday when temperatures soared once more.

Wildfires are common in Australia's summer months between December and February, and authorities are expecting a bad season this year due to low rainfall in the winter and forecasts of hot, dry weather ahead.

The blazes follow Australia's warmest 12 months on record, with the previous summer witnessing an unprecedented heatwave, as well as bushfires and floods.

The worst firestorm in recent years devastated southern Victoria state in 2009, razing thousands of homes and killing 173 people.

Fire scars big nature reserve in Ecuador's capitalQuito (AFP) Sept 23, 2013
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Fire blamed on arson has charred vast areas of a nature reserve in Ecuador's capital, officials said Monday as they declared the blaze under control.
It broke out Sunday in a huge expanse of Quito known as the Parque Metropolitano and it took 800 firefighters, police and soldiers backed by water-dumping planes nearly 24 hours to bring it under control.
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